Which of the following statement is correct about the program given below?

#include<iostream.h> 
class Tab
{
      int x; 
    public:
      Tab();
      void Show() const;
      ~Tab(){}
};
Tab::Tab()
{
    x = 5;
}
void Tab::Show() const
{
    cout<< x;
}
int main()
{
    Tab objB;
    objB.Show();
    return 0; 
}

#include<iostream.h> 
int main()
{
    float Amount;
    float Calculate(float P = 5.0, int N = 2, float R = 2.0);
    Amount = Calculate(); 
    cout<< Amount << endl; 
    return 0;
}

float Calculate(float P, int N, float R)
{
    int Year = 1;
    float Sum = 1 ;
    Sum = Sum * (1 + P * ++N * R);
    Year =  (int)(Year + Sum);
    return Year; 
}